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RESEARCH PAPERS

Cavitation Enhanced Heat Transfer in Microchannels

[+] Author and Article Information
Brandon Schneider, Ali Koşar, Chih-Jung Kuo

Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180

Chandan Mishra

 Intel Corporation, 2200 Mission College Boulevard, Santa Clara, CA 95052

Gregory S. Cole, Robert P. Scaringe

 Mainstream Engineering Corporation, 200 Yellow Place, Rockledge, FL 32955

Yoav Peles1

Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180pelesy@rpi.edu

1

Corresponding author.

J. Heat Transfer 128(12), 1293-1301 (Feb 21, 2006) (9 pages) doi:10.1115/1.2349505 History: Received September 01, 2005; Revised February 21, 2006

Heat transfer has been investigated in the presence of hydrodynamic cavitation instigated by 20-μm wide inlet micro-orifices entrenched inside 227-μm hydraulic diameter microchannels. Average surface temperatures, heat transfer coefficients, and pressure drops have been obtained over effective heat fluxes ranging from 39 to 558Wcm2 at mass flux of 1814kgm2s under noncavitating and three cavitating conditions. Significant heat transfer enhancement has been recorded during supercavitating flow conditions in comparison to noncavitating flows with minimal pressure drop penalty. Once supercavitating conditions were reached, no apparent heat transfer augmentation was detected with the reduction of the cavitation index. Visualization of the flow morphology and the heat transfer coefficient characteristics aided in the evaluation of the dominant heat transfer mechanism under various thermal-hydraulic conditions.

Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Hydraulic Grade Line (HGL) for fluid flow through a micro-orifice

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Figure 2

(a) CAD model of the microchannel device; (b) flow distributive pillars; (c) geometry of the inlet region (dimensions in μm)

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Figure 3

Experimental setup

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Figure 4

Heater electrical resistance-temperature calibration curve

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Figure 5

Heat loss curve for cavitating conditions

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Figure 6

CAD drawing of flow patterns

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Figure 7

(a) Liquid jets at the inlet region for intermediate size cavities (σ=0.11). (b) Zoom in to the inlet region for intermediate size cavities (σ=0.11).

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Figure 8

Short cavity at the inlet region (σ=0.223)

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Figure 9

Elongated bubbles near the exit region at adiabatic condition (σ=0.0282)

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Figure 10

Bubbly flow at the exit region for short cavities at adiabatic condition (σ=0.223)

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Figure 11

Flow map under adiabatic conditions

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Figure 12

Dimensionless pressure drop as a function of cavitation index

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Figure 13

Average surface temperature as a function of effective heat flux (σ=0.586 for noncavitating conditions, σ=0.028, 0.11, 0.223 for cavitating conditions)

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Figure 14

Heat transfer coefficients at cavitating (σ=0.0282) and noncavitating conditions (σ=0.586)

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Figure 15

Flow maps under diabatic conditions (q″=383W∕cm2): (a) based on the distance from the inlet, (b) based on local mass quality

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Figure 16

Nucleation at the exit region for short cavities (σ=0.223, q″=383W∕cm2)

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